The "test-var-set" command:

Usage: fossil test-var-set VAR ?VALUE? ?--file FILE?
Store VALUE or the content of FILE (exactly one of which must be
supplied) into variable VAR. Use a FILE of "-" to read from
standard input.
WARNING: changing the value of a variable can interfere with the
operation of Fossil. Be sure you know what you are doing.
Use "--blob FILE" instead of "--file FILE" to load a binary blob
such as a GIF.

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